Method of briquetting bushings



Dec. 29, 1931. c, SHQRT 1,839,056

METHOD OF BRIQUETTING BUSHINGS Filed Feb. 24, 1930 2 Sheets-Sheet 1 Dec. 29, 1931.

c. R. SI- lORT 1,839,056

METHOD OF BRIQUETT ING BUSHINGS Filed Fe 1950 2 Sheets-Sheet 2 gwwnto o Patented Dec. 29, 1931 sezm mnsfn. s oR'r or DAYTQN, onic, ASSIGNOR TOMORAINE rnonue rs commas TY; or c: r I DAYTON, OHIO, A CORPORATION or OHIO- l 7 METHOD OF snmunarme Resumes 7 This'invention relates to means and method of;hriq-uetting hushin'gs or similar articles "from powdered granular or semi-plastic nia- "ts-rials. 51 In the Patent1,'642,348 issued Sept 13,

"HETQt-O MI Williams et' all there are disclosed various formulae and method of makirrg selfl-uhrica-tinghearing bushings from metal-powder and other powdere ingredients. p V H Now the general object of this present invent-ioni-s to provide "a hriquetting apparatus and method ol-hriquetting such powdered ingredients into Ebu'shings Whose Walls will have a very uniform thickness and d ensity. When compacting powdered 1I1 Ltl1{tlS into relatively thin wall hushings it'1s- -often'd1fiieuit to insure "the proper tilling'ofthe-narrow die cavity with the loose powder charge since "suchpowder will not fl'o'w freely and perfect- IyEaSa liquid-"and hence small unfilled spaces may-occur in the die cavity or the loose charge will not be equally shaked down to auniform density throughout th'e die cavity.

' =1 'N'OSV this invention provides for very uniiff'orinly filling the die cavity with the loose charge oipowd'er to produce a finished article *"o-f uniform density and thickness of Wall. This is accomplished by providing the die cavity; with alongitudinallymovable and ro-- ta ta'bl'e 'centr-alcore. The central core is in withdrawn position from the die c avi'ty when thejfillingwith the loose powder is begun,

then t1 e'cen'tral-core is nioved'sl'owly upward 5 toward its'eore l orming position and simultaneously rotated during the filling with the loose charge, "whereby the loose pou' d'ered particles are equally distributed peripherally iatheennular space aboutthe core. A very uniform and complete filling; of "the annular {die cavity with the loose powder or granular material is thus obtained, I 'Frmther objects and advantages of the present invention will be apparent from p the folf'lowving' description;referenceb'einghadtoithe accompanying drawings wherein a preferred enibodinientof ons form of the present in-' gveatien is clearly shown. In the drawings VI iisinpartaside elevationand in part j e Application filed February 24, 1930; Serial wa-Aaogeae.

tion, and the punch descending to c ompact made according to this invention. a Figs. 2, 3 and 4 are Views illustrating varia vertical section through a bri'quetti'ngipress 'ous positions of certain operatingparts. Fig. A 2 illustrates the Withdrawn position of the 5 central core at the time thelo'ose' chargehegins to fall'withinthe die cavity. 1

Fig 3 shows the die cavity ahoutlhalf full With the loose powder and the "core in'ovin g upwardly withja rotatingmoti'on with itso upper end approximately even with the level of the powder. v

Fig. 4' shows the coreat itstop -m'ost piosi the material. r g 65 Similar reference characters rel'er to similar 1;)art's throughout-the several views.

Numeral 2O designates the stationary die having th'e'op'en en'd die cavity 21 therein. M The "lower tubular rain 22 is: received 1 Within 7-0 the lower-open end of cavity 21 and-a rotatable and vertically 'reciprocatable core 23 moves within the tubular ram 22 Fig! 2 shows the core 23 at its lovver most position leaving the Ecavity 21" entirely unobstru ctedffis The loose powder entersrcavity 21in a stream from the hopper 26 and the vibrating filling shoe 27. The core 123 moves upwardly with a rotating motion asth'e cavity is'iilled with the loose charge; preferably at such arate0 that the upper end thereof keeps substantially even with the upperleverof the loose pow der, Core 23is rotated-during its ascent at such a rate aslwill best aid iii-distributing the loose powder peripherally 'thereaboutl' t5 "Just prior tothe timecore 23 reaches the position'shown in Fig. 4, the filling shoe 2 Tis swung across the upper surface of die 20,

-leaving the die cavity filled approximately :flush with its top "with'the loo'se powder. '"Core 23-then noves'sli'ghtly beyond the uppersurfa'ce of die 20, as shown in Fig. 4:, and -.-the parts are then in position for the descent withdrawn downwardly T from within the formed bushing to the position shownin Fig. 2.7 The ,tubular ram 22; is then caused, by suitable mechanism; to move up and eject the formed bushing from cavity 21. This ejecting operation is greatly facilitatedby the tween the formed bushing and its outer die walls is very materially decreased when the inner core is withdrawn. By thus reducing the friction between bushing and die," the wear uponrthe die isxgreatly reduced and hence the cost of replac ng worn dies isfvery ,inaterially decreased;v Q I One form of machine,

actuating the parts heretofore mentioned will nowbe describedzf-=n r V i This machine (see Figrllinc'ludes abase 10v which supports the mainframe 11,; providing bearings for a power-driven main shaft'15 which'ca rries a crank pin 65. Crank} 'pin. 65 is connectedfwithjthe cross'headp in by suitable cams and hence,mayv be suitably. timed with the movement of punch; and

66 by connecting rod 67; Pin '66;hasbear- -ing upon cross head; 69 which is vertically reciprocable between" guides 70 supported upon the main frame '11. The bottom; endv of cross head 69 hasfixedthereto a socket mem bcr 72 which receives theZ-enlarged head-73 of annularpunch 25; -The reciprocating movement "of punch: 25 will1'now' be i clear. The other moving parts h'e'reinabove "described are all'driven from the'drive shaft-15 with each other- The filling shoe 27 is pivoted at thefpivot pin 28 and'is'actuated to swing and to oscillate about the pivot 28 by cam-30 ,on main shaft 15." The lever 31 has a fixedfpivo't at 32',

' i a cam follower 33 riding incam groove '30,

and a link3 t. connecting its lower end: to the filling shoe 27' whereby said shoe will be 1 brought" into registration" with'the dic cav- 6 on main shafti15, a cam follower- 41 011 bell ity 21 at the propertime for filling same and then give several rapid oscillations or shakes in order to dischargethe loose molding pow- 1 der in a. more or less steady streaminto the die cavity 21. T 5

An: appreciable time is'required'to thus fill the dieccavity, during which time core 23 is raised from c the position shown 'inFigi 2v to -that.shown in Figft by means ofaleve'r crank lever. {12, pivoted at 43, and.a long link 4A.- Simultaneouslyfwith itsfup movement,

' core 23-is rotated by a pinion 45 which slides longitudinally 'upon the square portion- 46 i on'fthe lowerend of-core 23. Pini 45 i for supporting and? geared to the sliding rack 47 which is actuated by the long lever 48, pivoted at 49, and hav- 7.

suitable mechanism the core 23 may be rapidly rotated while it moves upthrough the loose powder charge as it fills the die' cavity 21.

Core 23 remains stationary in the position p M p shown in Fig. 4 until after thematerial is previous withdrawal offcore 23 fromthef bushing since the high pressure'contact becomp'acted by punch 5 25-, after 'which -it is and 50 are so relate that core 23 is withdrawn 7 7 from the formed bushing without rotation "until it clearsthe bushing,after which it may 7 be'rotated idly to bring rack'47 back to its initial position as shown; in Fig. ,2.' Main punch 25 -preferably'begins its descent while core 23 is yet" moving u and preferably engages core 23 shortly a eritreaches itsitop position as shown in'Fig.-4. The powdered materialis compactedunderaveryhighpresp a sure bypunch 25 into a quite hardirrigid bushing, after which punch 25 is immediately Withdrawn from the cavity121 and core23 is. -WlthdIflWD downwardly from 'its' position 7 within the formed bushing by the camtOc The form'edbu'shingisnow ejected bythe up movement of the annular ejecting ram 22% which'is actuated by 1everj55 pivoted at 56 and having a forkedend57 engaging the two flanges 58 fixedto the large s1eeve 59- 1 which'rigidly supports the ejecting ram22 as; clearly sh'own in Fig.-y1 -;Lever: is actu 'ated by cam 60011 main. shaft15 through the 10am follower 61"on bell crank lever62, pivoted at 63, and thesconnectingjlink After return to the position shown in Fig. 2, whereupon the cycle may be repeated'. When-the filling shoe 27 swings across the. topface of 7 "the die 20, it' engages the previously ejected I ent invention as herein disclosed, constitutes a preferred; form, itis to understood that.

other "forms might be adopted, all coming within thescope ofthe claims'which follow.

' What is claimed isas follows -1. The steps'in the method of briquetting V cored bodies comprising: -withdrawing the mold core from the .briquetting moldcavity,

ejection of, the formed bushing, the'partsall then filling said' cavity with the loose mate- V rial to be briquettedj and simultaneously, moving'sa'id core through the loose materialwith a rotating motion to'distributethe charge uniformlyn within the cavity, then compacting the chargeby hollowpunch.

2. The' steps -in the method of briquetting cored' bodies comprising? filling the mold cavity with v the; loose 51p owdered material to bebriquett'ed, andwhilesorfillingmoving the i mold core through the materialwith'a rotat 1 7 ing motion whereby to more evenly distribute the charge as it enters, then compacting the charge with a hollow punch fitting upon the 3. The steps in the method of briquetting annular bushings comprising: pouring the loose material into the mold cavity while the mold core is moving to its core-forming position in the mold cavity, and simultaneously rotating said core to uniformly distribute the charge as it enters the cavity.

4. The steps in the method of briquetting annular bushings comprising: moving the mold core axially to its core forming position in the mold cavity with a' rotating motion and simultaneously pouring the loose material into the cavity to fill same at such rate as to maintain the level of the material approximately even .with the advancing end of the core. V

In testimony whereof 1 hereto atfix my signature.

CHARLES R. SHORT.

Val 

